: I am building a wood Frame Yost Sea Ranger large coaming. I was wondering if
: 1/4 inch oak will be strong enough for the cockpit bottom boards. Since
: this is the large coaming version, these boards need to span 29. Thanks
: for any advice (for reference, Yost recommends 3/8" cedar)

I used 1/4" ply for mine and it's held up just fine, it's quite springy btw, good thing for sitting on wood

Try cutting a few pieces of oak and try it.

Bill H.